Type-writer platen.



P. DE CLAMECY." TYPE WRITER PLATENI APPLICATION FILED MAY I6. I9I6r Patented-Aug. 21,1917.

\ shows the different portions of the netting 3 which may be struck by a type 6. Figt 4C illustrates the dampering effect of the 1nterlaced members of the Woven backing.

As Will be evident, the vibration of any particular portion of either a transverse 'or a longitudinal strand is checked and stopped at practically its inception by the other strands which bear on it from above and below. i This prevents vibrations oi' any considerable Wave length from being set up or from extending over any considerable area, thus eliminating sound to a large degree..

The wire core 8 is provided With a rubber covering 4 drawn or formed over the Wire but substantially rindependent thereof.'

The molecules of this covering have a very low responsiveness to sound waves, and assist to deaden the noises produced by the striking type. l V f yThe chambers deined'by the Woven shell 3 and disks 2 are filled with some fibrous material 5, the molecules of which are pretaerably of a non-vibrating nature. I iind ordin'ary cotton wadding well adapted for this purpose in that it absorbs the sound and kills the repercussion entirely.

In assembling my platen, the cotton wadding is laid about the rod 1, and the Wire core with its lrubber covering is slipped over said rod in inclosing relation thereto.

From the foregoing,4 it will be seen that my platen practically deadens the sound waves prodaiced by the shock or" the type strikingthe platen. The sound of the type against the paper or other surface being written upon, which surface is usually a good conductor oie/sound, can not be of course eliminated, but the sound caused by the type striking" against the platen. is so absorbed and distributed as to be practically silenced.

Various modifications in the form and construction of my invention may obviously be resorted to if within the limits of the appendedclaims.

Nhat l therefore claim and desire to secure by Letters Patent 1s:

1. A typewriter platen consisting of anV external impact receiving surface, a Woven shell inclosed by said surface, but wholly free of connection therewith so that the individual strands of the shell are substantially free to vibrate, a bearing shaft. a

nesten? 3. A typewriter platen consisting of ashaft, a plurality of supporting elements, a Woven wire backing inclosing said elements and having its individual strands substantially free to vibrate, and a filling of fibrous material within said backing and an external impact receiving surface supported on said backing.

4f. A typewriter platen consisting of an external impact receiving envelop, -and a cylindrical woven wire backing inclosed by said envelop but wholly free ot' connection therewith so that the individual strands of .said backing are substantially free to vibrate.

5. A typewriter platen consisting of an external impact receiving surface, and a core of reticulated material inclosed by said surface but wholly free of connection there- .with so that the individual strands of the core are free to vibrate to thereby break the continuity of transmission of sound waves.

6. A typewriter platen including an external impact receiving surface, and a core of woven wire inclosed by said surface, but wholly free of connection therewith so that the individual strands of said core are free to vibrate to thereby break the continuity of transmission .of sound Waves.

7. A typewriter platen including an eX- ternal impact receiving surface, and a core of woven wire netting inclosed by said surface but wholly free of connection therewith so that the individual strands oi' the netting are substantially free to vibrate, said strands being disposed at right angles to each other, and one set being parallel to and the other set at right angles to the axis of rotation of the platen.

In testimony whereof I aiiii: my signature in presence of two Witnesses.

PHILPPE nu @LAMES-fil `Witnesses MARY P. VVo'rHnnsrooN, AGNES V.' OOoNNnLi..

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